<!DOCTYPE html>
<html>
  <head>
      <meta charset="UTF-8">
      <title>上下文菜单</title>

      <script src="event.js"></script>
  </head>
  <body onload="onload()">
   <h1>上下文菜单</h1>
   <div id="panel" style="background-color:brown;width:300px;height:200px"></div>

  </body>
</html>
